Velleman K8204 Z Axis Upgrade Rod and Coupler for Model K8200 3D Printer, 1 Grade to 12 Grade Go to amazon.com Related posts Top velleman k8200 3d printer FeaturePrecision threaded rod lead screwFollower nutFlexible coupler DescriptionImproves z-axis accuracy, eliminates printing wobble, strongly advised for direct drive 0.35mm printing.